如何在 Java 中从浮点数转换为 4 个字节？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14308746/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to convert from a float to 4 bytes in Java?
提问by user1395152
I have not been able to convert something like this:
我一直无法转换这样的东西：
byte[] b = new byte[] { 12, 24, 19, 17};
into something like this:
变成这样：
float myfloatvalue = ?;
Could someone please give me an example?
有人可以给我一个例子吗？
Also how to turn that float back to bytes?
还有如何将浮点数转回字节？
回答by Tomasz Nurkiewicz
byte[]-> float
byte[]-> float
With ByteBuffer:
byte[] b = new byte[]{12, 24, 19, 17};
float f = ByteBuffer.wrap(b).getFloat();
float-> byte[]
float-> byte[]
Reverse operation (knowing the result of above):
反向操作（知道上面的结果）：
float f = 1.1715392E-31f;
byte[] b = ByteBuffer.allocate(4).putFloat(f).array(); //[12, 24, 19, 17]
回答by Reimeus
From byte[]-> float, you could do:
从byte[]-> float，你可以这样做：
byte[] b = new byte[] { 12, 24, 19, 17};
float myfloatvalue = ByteBuffer.wrap(b).getFloat();
Here is an alternative to using ByteBuffer.allocatefor converting float-> byte[]:
这是ByteBuffer.allocate用于转换的替代方法float-> byte[]：
int bits = Float.floatToIntBits(myFloat);
byte[] bytes = new byte[4];
bytes[0] = (byte)(bits & 0xff);
bytes[1] = (byte)((bits >> 8) & 0xff);
bytes[2] = (byte)((bits >> 16) & 0xff);
bytes[3] = (byte)((bits >> 24) & 0xff);
回答by Chris
Convert the bytes to an int and use Float.intBitsToFloat()
将字节转换为 int 并使用 Float.intBitsToFloat()
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Float.html#intBitsToFloat(int)
http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Float.html#intBitsToFloat(int)
